EUVD-2026-62726
GHSA-pmq5-6568-8497
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable unauthenticated SSL endpoint; no credentials needed; impact confined to availability via resource exhaustion with no confidentiality or integrity effect.
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service due to improper handling of a missing SSL client certificate.
AnalysisAI
Remote denial of service in IBM AIX 7.2 and 7.3 and IBM PowerVM VIOS 4.1 allows unauthenticated network attackers to crash or exhaust resources in the SSL subsystem by omitting an expected client certificate during the TLS handshake. The CVSS 7.5 rating (AV:N/AC:L/PR:N/UI:N) confirms low attack complexity with no authentication required, making exploitation straightforward against any exposed SSL service on affected systems. No public exploit code and no CISA KEV listing have been identified at time of analysis, but the patch is available and should be prioritized for internet-facing AIX and VIOS deployments.
Technical ContextAI
IBM AIX is a proprietary UNIX operating system running on IBM Power hardware; IBM PowerVM VIOS (Virtual I/O Server) is the virtualization management layer for Power systems. The vulnerability maps to CWE-400 (Uncontrolled Resource Consumption), indicating the SSL implementation fails to gracefully handle the absence of a client certificate during mutual TLS (mTLS) negotiation. When a service is configured to require SSL client certificate authentication, the missing certificate condition is not properly bounded or rejected, leading to resource exhaustion or a crash. Affected CPEs are cpe:2.3:a:ibm:aix:*:*:*:*:*:*:*:* (versions 7.2 and 7.3) and cpe:2.3:a:ibm:powervm_vios:*:*:*:*:*:*:*:* (version 4.1).
RemediationAI
IBM has released a patch per the vendor advisory at https://www.ibm.com/support/pages/node/7283858; the exact fix version or PTF number must be retrieved directly from that page, as no specific version string was included in the available intelligence. Apply the IBM-provided fix for AIX 7.2, AIX 7.3, or PowerVM VIOS 4.1 as appropriate. Where immediate patching is not possible, a compensating control is to restrict network access to SSL services on affected systems using host-based or perimeter firewall rules, specifically blocking inbound connections to any port where client-certificate-required TLS is configured. This does not eliminate the vulnerability but significantly narrows the exposure to trusted network segments. Note that restricting VIOS management network access may affect virtual machine provisioning and I/O operations - coordinate with virtualization operations teams before applying network-level mitigations.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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